Adaptive finite element simulation of stack pollutant emissions over complex terrains
TL;DR: In this article, a three-dimensional finite element model for the pollutant dispersion is presented, where the first stage consists on the construction of an adaptive tetrahedral mesh of a rectangular region bounded in its lower part by the terrain and in its upper part by a horizontal plane.
About: This article is published in Energy.The article was published on 2013-01-01 and is currently open access. It has received 26 citations till now. The article focuses on the topics: Finite element method & Discretization.
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TL;DR: In this paper, a hybrid unsteady Reynolds averaged Navier Stokes (RANS) and large eddy simulation (LES) numerical approach is applied with a new mixed scale sub-grid parameterization technique in the commercial ANSYS Fluent software in order to simulate the buoyant plume behavior in a turbulent crossflow.
9 citations
TL;DR: In this article, the source identification problem in air pollution modeling is described by an advection-diffusion equation with physically realistic coefficients, which is solved by the combination of adaptive meshes and a stabilized finite element method.
9 citations
TL;DR: The number of thermal power plants is growing due to the industry development and the growth of energy consumption as mentioned in this paper, which leads to an increase in harmful emissions in the atmosphere, and this leads to the need for more power plants.
Abstract: The number of thermal power plants is growing due to the industry development and the growth of energy consumption. This leads to an increase in harmful emissions in the atmosphere. There is a nece...
5 citations
TL;DR: In this article, an esquema adaptativo for problemas tridimensionales de conveccion-difusion discretizados mediante el Metodo de Elementos Finitos is presented, where remallado permite aumentar o disminuir drasticamente el tamano de los elementos in one single paso, de forma automatica.
Abstract: Resumen Se presenta un esquema adaptativo para problemas tridimensionales de conveccion-difusion discretizados mediante el Metodo de Elementos Finitos. El esquema adaptativo incluye una estrategia de remallado basada en la imposicion de un volumen maximo de los elementos a partir de una malla de referencia. El remallado permite aumentar o disminuir drasticamente el tamano de los elementos en un solo paso, de forma automatica. Se mantiene una calidad de la malla adecuada; y, como consecuencia, el numero de iteracciones necesarias para solucionar el sistema de ecuaciones lineales mediante algoritmos iterativos se mantiene constante. Se presentan 2 ejemplos de caracteristicas muy distintas que permiten analizar la propuesta para un amplio rango de situaciones. Uno es una extension tridimensional del problema de Smolarkiewicz y el otro es una version simplificada del problema de transporte de contaminacion emitida por un emisor puntual. Los resultados muestran la flexibilidad de la propuesta. Es posible encontrar un valor optimo de frecuencia de remallado, desde el punto de vista de coste computacional y precision de los resultados, para ambas tipologias extremas de problemas.
5 citations
TL;DR: A graph-grammar-based algorithm for the longest-edge refinements and the pollution simulations in Lesser Poland area that automatically guarantees the validity and conformity of the generated mesh and prevents the generation of duplicated nodes and edges, elongated elements with Jacobians converging to zero, and removes all the hanging nodes automatically from the mesh.
Abstract: In this paper, we propose parallel graph-grammar-based algorithm for the longest-edge refinements and the pollution simulations in Lesser Poland area. We introduce graph-grammar productions for Rivara’s longest-edged algorithm for the local refinement of unstructured triangular meshes. We utilize the hyper-graph to represent the computational mesh and the graph-grammar productions to express the longest-edge mesh refinement algorithm. The parallelism in the original Rivara’s longest edge refinement algorithm is obtained by processing different longest edge refinement paths in different three ads. Our graph-grammar-based algorithm allows for additional parallelization within a single longest-edge refinement path. The graph-grammar-based algorithm automatically guarantees the validity and conformity of the generated mesh; it prevents the generation of duplicated nodes and edges, elongated elements with Jacobians converging to zero, and removes all the hanging nodes automatically from the mesh. We test the algorithm on generating a surface mesh based on a topographic data of Lesser Poland area. The graph-grammar productions also generate the layers of prismatic three-dimensional elements on top of the triangular mesh, and they break each prismatic element into three tetrahedral elements. Next, we propose graph-grammar productions generating element matrices and right-hand-side vectors for each tetrahedral element. We utilize the Streamline Upwind Petrov–Galerkin (SUPG) stabilization for the pollution propagation simulations in Lesser Poland area. We use the advection–diffusion-reaction model, the Crank–Nicolson time integration scheme, and the graph-grammar-based interface to the GMRES solver.
5 citations
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2,290 citations
"Adaptive finite element simulation ..." refers background in this paper
...For instance, detailed Volatile Organic Components decomposition involves hundreds of thousand reactions [63, 64] that needs special methodologies to reduce the number of the modelled reactions and...
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TL;DR: In this article, two important aerosol species, sulfate and organic particles, have large natural biogenic sources that depend in a highly complex fashion on environmental and ecological parameters and therefore are prone to influence by global change.
Abstract: Atmospheric aerosols play important roles in climate and atmospheric chemistry: They scatter sunlight, provide condensation nuclei for cloud droplets, and participate in heterogeneous chemical reactions. Two important aerosol species, sulfate and organic particles, have large natural biogenic sources that depend in a highly complex fashion on environmental and ecological parameters and therefore are prone to influence by global change. Reactions in and on sea-salt aerosol particles may have a strong influence on oxidation processes in the marine boundary layer through the production of halogen radicals, and reactions on mineral aerosols may significantly affect the cycles of nitrogen, sulfur, and atmospheric oxidants.
1,589 citations
"Adaptive finite element simulation ..." refers background in this paper
...The complete description of photochemical reaction of atmospheric species is highly complex [59, 60, 61, 62]....
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Book•
03 Feb 1984
TL;DR: In this article, an up-to-date summary of the current knowledge of the statistical characteristics of atmospheric turbulence and an introduction to the methods required to apply these statistics to practical engineering problems is presented.
Abstract: Presents, in a single volume, an up-to-date summary of the current knowledge of the statistical characteristics of atmospheric turbulence and an introduction to the methods required to apply these statistics to practical engineering problems. Covers basic physics and statistics, statistical properties emphasizing their behavior close to the ground, and applications for engineers.
1,138 citations
"Adaptive finite element simulation ..." refers background in this paper
...It takes into account the horizontal interpolation and the effect of roughness on the wind velocity [46, 47, 48, 49, 50]....
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TL;DR: OH, NO3, and O3 are shown to play a central role in the formation and fate of airborne toxic chemicals, mutagenic polycyclic aromatic hydrocarbons, and fine particles.
Abstract: Tropospheric air pollution has impacts on scales ranging from local to global. Reactive intermediates in the oxidation of mixtures of volatile organic compounds (VOCs) and oxides of nitrogen (NOx) play central roles: the hydroxyl radical (OH), during the day; the nitrate radical (NO3), at night; and ozone (O3), which contributes during the day and night. Halogen atoms can also play a role during the day. Here the implications of the complex VOC-NOx chemistry for O3 control are discussed. In addition, OH, NO3, and O3 are shown to play a central role in the formation and fate of airborne toxic chemicals, mutagenic polycyclic aromatic hydrocarbons, and fine particles.
1,065 citations
"Adaptive finite element simulation ..." refers background in this paper
...The complete description of photochemical reaction of atmospheric species is highly complex [59, 60, 61, 62]....
[...]
Book•
02 Jun 2003
TL;DR: An introduction to monotonicity-preserving schemes and other stabilization techniques and new trends in fluid dynamics, and main issues in incompressible flow problems.
Abstract: Preface. 1. Introduction and preliminaries. Finite elements in fluid dynamics. Subjects covered. Kinematical descriptions of the flow field. The basic conservation equations. Basic ingredients of the finite element method. 2. Steady transport problems. Problem statement. Galerkin approximation. Early Petrov-Galerkin methods. Stabilization techniques. Other stabilization techniques and new trends. Applications and solved exercises. 3. Unsteady convective transport. Introduction. Problem statement. The methods of characteristics. Classical time and space discretization techniques. Stability and accuracy analysis. Taylor-Galerkin Methods. An introduction to monotonicity-preserving schemes. Least-squares-based spatial discretization. The discontinuous Galerkin method. Space-time formulations. Applications and solved exercises. 4. Compressible Flow Problems. Introduction. Nonlinear hyperbolic equations. The Euler equations. Spatial discretization techniques. Numerical treatment of shocks. Nearly incompressible flows. Fluid-structure interaction. Solved exercises. 5. Unsteady convection-diffusion problems. Introduction. Problem statement. Time discretization procedures. Spatial discretization procedures. Stabilized space-time formulations. Solved exercises. 6. Viscous incompressible flows. Introduction Basic concepts. Main issues in incompressible flow problems. Trial solutions and weighting functions. Stationary Stokes problem. Steady Navier-Stokes problem. Unsteady Navier-Stokes equations. Applications and Solved Exercices. References. Index.
1,035 citations